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A177224
a(n) is the least prime of the form ((2n+1)^k - (2n-1)^k)/2.
0
13, 609554401, 109, 193, 51001, 433, 44937854708156010721, 769
OFFSET
1,1
COMMENTS
a(9) = (19^163 - 17^163)/2 is too large to include here.
Corresponding values of k (odd primes) are listed in A122478.
FORMULA
a(n) = ((2n+1)^A122478(n) - (2n-1)^A122478(n)) / 2.
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Alexander Adamchuk, May 05 2010
EXTENSIONS
Edited by Max Alekseyev, May 16 2010
STATUS
approved